Made using a custom version of the MAME 0.164
VGM mod that support the game, which was added
between MAME 0.166 and 0.167.
Size reduction (vgm_cmp):
205 KB -> 141 KB (68.7 %)
Hacking Notes:
The sound driver is SMPS 68k. It does a few
things differently from MegaDrive SMPS though.
Sound RAM: FFF400+
Sound Queue: FFF7D0-F80F
Sound Queue Write Pointer: FFF810/11
Sound Queue Read Pointer: FFF812/13
In order to play a song, set FFF7D0 = SongID,
then set FFF811 = 01 and FFF813 = 00.
Sound Test ID list: 0026B2
PlaySound routine: 00099A
PlaySound wrapper: 0064BE (Put the sound ID in
register D7 and set D6 to 0. The routine skips
playing the sound if register D6 is nonzero.)